Measurement of triple-gauge-boson couplings of the W boson at LEP

• Published in: Physics letters. B Vol. 586; no. 3-4; pp. 151 - 166
• Main Authors: Aloisio, A., Alviggi, M.G., Arefiev, A., Bajo, A., Banerjee, Sw, Becattini, F., Bellucci, L., Biglietti, M., Biland, A., Blaising, J.J., Böhm, A., Boldizsar, L., Branson, J.G., Capell, M., Cartacci, A., Casaus, J., Cavallo, N., Chemarin, M., Chen, H.S., Chiefari, G., Cifarelli, L., de la Cruz, B., de Asmundis, R., De Salvo, A., Dionisi, C., El Hage, A., Engler, A., Extermann, P., Fisk, I., Freudenreich, K., Garcia-Abia, P., Gentile, S., Giagu, S., van Gulik, R., Hofer, H., Hou, S.R., Jones, L.W., Kaur, M., Kraemer, R.W., Laktineh, I., Landi, G., Lebeau, M., Lecoq, P., Levtchenko, M., Lin, C.H., Linde, F.L., Lohmann, W., Luci, C., Luminari, L., Martin, J.P., Marzano, F., Mele, S., Meschini, M., Metzger, W.J., Mnich, J., Natale, S., Newman, H., Novak, T., Paolucci, P., Patricelli, S., Pauluzzi, M., Pauss, F., Pensotti, S., Pioppi, M., Pojidaev, V., Rancoita, P.G., Ren, D., Riemann, S., Riles, K., Romero, L., Rosenbleck, C., Rosier-Lees, S., Rykaczewski, H., Saremi, S., Sarkar, S., Sciacca, C., Shevchenko, S., Shivarov, N., Shoutko, V., Shvorob, A., Son, D., Tang, X.W., Timmermans, C., Ting, S.M., Tung, K.L., Ulbricht, J., Valente, E., Van de Walle, R.T., Vasquez, R., Vesztergombi, G., Vetlitsky, I., Vicinanza, D., Vogel, H., Vogt, H., Wang, Q., Wang, X.L., Wynhoff, S., Yang, C.G., Yang, M., Zöller, M.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 29.04.2004; Elsevier Science; Elsevier
• Subjects: Astronomy; Earth, ocean, space; Exact sciences and technology; General, solar nebula, and cosmogony; High Energy Physics - Experiment; Physics; Solar system; Standard model; W bosons; Leptonic decays
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/j.physletb.2004.02.045

The CP-conserving triple-gauge-boson couplings, g1Z, κγ, λγ, g5Z, κZ and λZ are measured using hadronic and semi-leptonic W-pair events selected in 629 pb−1 of data collected at LEP with the L3 detector at centre-of-mass energies between 189 and 209 GeV. The results are combined with previous L3 measurements based on data collected at lower centre-of-mass energies and with the results from single-W production and from events with a single-photon and missing energy. Imposing the constraints κZ=g1Z−tan2θW(κγ−1) and λZ=λγ, we obtain for the C and P conserving couplings the results: g1Z=0.966±0.033(stat)±0.015(syst),κγ=1.013±0.066(stat)±0.026(syst),λγ=−0.021±0.035(stat)±0.017(syst). Results from the analysis of fully leptonic W-pair decays are also given. All results are in agreement with the Standard Model expectations and confirm the existence of self-couplings among electroweak gauge bosons.